Graeme Clark Collection

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http://hdl.handle.net/11343/375

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1972 - 1974 3
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End date: 1979 × Type: Conference Item × Subject: otolaryngology × Subject: otology ×

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    Auditory evoked potentials and auditory sequential memory [Abstract]
    Clark, Graeme M. ; Knight, Lyall J. ; Stanley, Gordon V. ( 1974)
    The evaluation of intelligence in infants and young children is important in assessing their prognosis and institutional placement, and is difficult with present clinical methods. Therefore, the recent studies which show a correlation between visual evoked responses and intelligence are of value. It is also of importance to determine if auditory evoked potentials may be used in assessing children with communication disorders, as their defect frequently involves the auditory system, and they will often require evoked response audiometry to exclude loss of hearing from the diagnosis.
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    Auditory evoked responses to frequency and amplitude modulated sound
    Rickards, Field W. ; Clark, Graeme M. ( 1973)
    Auditory evoked responses to pure tone bursts have been described in a number of studies and have been characterized by the P1, N1 and P2 components. The presence of later components, namely N2, P3 and the Contingent Negative Variation, depends largely on the cerebral processing of the stimulus. These evoked responses have been recorded using tone bursts. However, neurophysiological studies have shown that the cortex codes complex sounds. Therefore, we performed a set of acute experiments on the cat, using frequency and amplitude modulated sounds. This was reported in a previous study (Richards and Clark, 1972) which showed that similar onset and later waves could be recorded from the cortex of the cat. In some areas of the cortex the later waves were in synchrony with the modulation envelope.
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    The design of an ear bar system for auditory neruophysiological research
    Tong, Y. C. ; Pengilley, C. J. ; Clark, Graeme M. ( 1972)
    Absolute sound intensity measurements at the ear drum are important in auditory research. Previous attempts to measure sound intensity using a small bore probe tube coupled to a microphone have proved unsatisfactory. In the present investigation an alternative system employing two condenser microphones coupled to the input end of the ear bar was used to estimate the sound intensity at the ear drum. Consideration was also given to minimizing harmonic distortion and resonance in the system.